Double try-square



(No `Mo'dei.) ,A i f C. HUPFMEISTER. Double Square. 1 No.235-,434- v| :.nente| Dec. 14,1880.

WITNBSSBS: INVBNTOR:

Y BY- y@ ATTORNEYS.

UNITED STATES PATENT EEICEO VILLIAM C. HOFFMEISTER, OF MOSSY GREEK, TENNESSEE.

DOUBLE TRY-SQUARE.

SPECIFICATION forming part of Letters Patent No. 235,434, dated December 14, 1880.

Application filed october 15,1880. (No model.)

To all 'whom it may concern Beit known that I, WILLIAM C. HoEEMEis- TER, of Mossy Creek, in the county of J efferson and State o f Tennessee, have invented a new and Improved Double Try-Square, of which the following is a specification.

The object of thisinvention is to provide an improved device for the convenience of laying out, marking`or scribing work.

The invention consists of two ordinary trysquares joined together side by side, a suitable and adjustable distance apart, by a metal plate and screws or other suitable device, so that said squarermay be adjusted to straddle boa-rds of different thicknesses.

Figure 1 represents a side elevation of the improved combination-square; Fig. 2, an end elevation of the same. Fig. 3 indicates its use for cutting in siding-boards on a house. Fig, 4 indicates its application for scribin g irregular faces. Fig. 5 shows the manner of setting the cuts in putting down wash bases or boards in houses. Fig. 6 shows its use in marking the projecting ends of boards that are to be cut 0E, as in boxing, &c. Fig. 7 shows its application for ascertaining the projections of table-leaves, roofs, Sto. Fig. 8 shows its application to the same purpose as shown inFig. 3, excepting that the end of the board is to be mitered. Fig. 9 shows the application of the square in marking a head-joint.

Similar letters of reference indicate corresponding parts. l

The ordinary try-square consists of a thin blade of metal projecting at right angles from a thick block of wood or metal forming a species of handle, the edges of both blade and block being accurately straight.

In the drawings, A' A' represent two ordinary try-squares set side by side parallel with each other and held together by a metal plate, B, secured` to their backs by screws or other convenient devices, a a, thereby forming my improved double square A. The screw-holes b ofthe said plate B are slotted, as shown, to permit the adjustment of the squares A A nearer toor farther from each other, for convenient application to boards of different thicknesses.

Some ofthe advantages of thisfdouble square A over those in common use are indicated in the drawings.

In Figs. 3, 6, and 8 the square A is shown set straddling on boards c, with an inner arm set against a guiding object, such as a window- 5 casing, side of a box, or rafter, d, so that the said boards c can be marked or scribed on the face or outside, thus enabling the operator to saw the boards accuratelyeven if the edge of casing is not square, or is not put on square, as sometimes happens, and saving time and labor in try-tting, &c.

In Fig. 4 the square A is shown applied to an irregular object, j', such as a strip of molding or cornice, the short wooden arm of the said square A being set against the straight edge of the said molding f', and the long metal arm extended over the irregular face thereof. The two long arms ofthe square A, being parallel and apart from eachother, afford a correct guide and support for the scratch-awl C in scribin g a straight line upon the irregular face of said object f.

In Fig. 7 the position of the square A indicates the manner of ascertaining the width of 7 the projection of a'table top or leaf, g, wherein the square A is made to straddle the edge of said table top or leaf g, so that an end of the square arm shall abut against the table-frame beneath said top or leaf g, while the other long arm shall rest on the top of said leaf or top, so that with the scratch-awl C the proper measurement may be marked off.

In Fig. 5 the square A is made to straddle the base-board h, whereby said square can 8 take as a guide the inner edge of the upright molding t.

In Fig. 9 the square A is shown applied to boards 7c for the purpose of marking a headjoint, said square A being made to straddle the boards 7c, with its short arm parallel with the straight edge of said boards k, so that the ends of one or both of said boards 7c can be scribed at right angles to the edges.

This tool can also be used for all purposes to which the ordinary try-square is adapted, and is easily adjusted, simple, and accurate, and the cost of construction is but triliing, and

by removing the connecting-plate B two trysquares of ordinary construction are furnished.

I do not limit or confine myself to the exact form of the device or method herein showni'or 5 joining or adjusting the two trysquares, as

other devices or methods that will produce the results herein mentioned may be used.

Having thus fully described my invention,

I claim as new and desire to secure by Let- 1o ters Patent- 1. As an improved article ot' inanuiieture,

a double try square made substantially as herein shown and described, consisting ot' two try-squares held together side by side by fast- 

